/* Copyright */
/*******************************************************************************
 * The MIT License (MIT)
 *
 * Copyright (c) 2014 Tsunagi-BPM
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 *******************************************************************************/
 /* Copyright End */
 
package tsunagi.json.path;

import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;

import tsunagi.json.path.condition.Condition;
import tsunagi.json.path.condition.ConditionHandler;

public enum JsonPathUtil {
	INSTANCE;
	
	public JsonObjectType identifyObjectType(JSONObject obj, String token) {
		try {
			Object prop = obj.get(token);
			if (prop != null && !(prop instanceof JSONObject) && !(prop instanceof JSONArray)) {
				return JsonObjectType.PROPERTY;
			}
		} catch (JSONException e) {
			// go to next step
		}
		try {
			JSONObject json = obj.getJSONObject(token);
			if (json != null) {
				return JsonObjectType.OBJECT;
			}
		} catch (JSONException e) {
			// go to next step
		}
		try {
			JSONArray array = obj.getJSONArray(token);
			if (array != null) {
				return JsonObjectType.ARRAY;
			}
		} catch (JSONException e) {
			// go to next step
		}
		return null;
	}
	
	public String removeCondition(String token) {
		String result = token;
		int index = token.indexOf(Tokenizer.DELIM_ARRAY_COND_START);
		if (index > -1) {
			result = token.substring(0, index);
		}
		return result;
	}
	
	/**
	 * Current implementation supports only "Property"="Value".
	 * 
	 * @param obj
	 * @param cond
	 * @return
	 */
	public boolean isConditionMet(JSONObject obj, ConditionHandler condHandler) {
		boolean result = true;
		Condition cond = null;
		String objVal = null;
		while((cond = condHandler.next()) != null) {
			try {
				objVal = obj.getString((String)cond.getLeft());
			} catch(JSONException e) {
				objVal = ""; // just avoid null
			}
			String val = (String)cond.getRight();
			if (!objVal.equals(val)) {
				result = false;
			} else {
				result = true;
			}
			condHandler.setCurrentResult(result);
		}
		return condHandler.isCurrentResult();
	}
}
